Class has too many lines. [124/100] Open
class MiGA::Cli < MiGA::MiGA
require 'miga/cli/base'
require 'miga/cli/opt_helper'
require 'miga/cli/objects_helper'
require 'miga/cli/action'
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This cop checks if the length a class exceeds some maximum value. Comment lines can optionally be ignored. The maximum allowed length is configurable.
Method has too many lines. [14/10] Open
def ask_user(question, default = nil, answers = nil, force = false)
ans = " (#{answers.join(' / ')})" unless answers.nil?
dft = " [#{default}]" unless default.nil?
print "#{question}#{ans}#{dft} > "
if self[:auto] && !force
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This cop checks if the length of a method exceeds some maximum value. Comment lines can optionally be ignored. The maximum allowed length is configurable.
Assignment Branch Condition size for ask_user is too high. [19.21/15] Open
def ask_user(question, default = nil, answers = nil, force = false)
ans = " (#{answers.join(' / ')})" unless answers.nil?
dft = " [#{default}]" unless default.nil?
print "#{question}#{ans}#{dft} > "
if self[:auto] && !force
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This cop checks that the ABC size of methods is not higher than the configured maximum. The ABC size is based on assignments, branches (method calls), and conditions. See http://c2.com/cgi/wiki?AbcMetric
Cyclomatic complexity for ask_user is too high. [9/6] Open
def ask_user(question, default = nil, answers = nil, force = false)
ans = " (#{answers.join(' / ')})" unless answers.nil?
dft = " [#{default}]" unless default.nil?
print "#{question}#{ans}#{dft} > "
if self[:auto] && !force
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This cop checks that the cyclomatic complexity of methods is not higher than the configured maximum. The cyclomatic complexity is the number of linearly independent paths through a method. The algorithm counts decision points and adds one.
An if statement (or unless or ?:) increases the complexity by one. An else branch does not, since it doesn't add a decision point. The && operator (or keyword and) can be converted to a nested if statement, and ||/or is shorthand for a sequence of ifs, so they also add one. Loops can be said to have an exit condition, so they add one.
Method has too many lines. [13/10] Open
def initialize(argv)
@data = {}
@defaults = { verbose: false, tabular: false }
@opt_common = true
@original_argv = argv.dup
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This cop checks if the length of a method exceeds some maximum value. Comment lines can optionally be ignored. The maximum allowed length is configurable.
Perceived complexity for ask_user is too high. [10/7] Open
def ask_user(question, default = nil, answers = nil, force = false)
ans = " (#{answers.join(' / ')})" unless answers.nil?
dft = " [#{default}]" unless default.nil?
print "#{question}#{ans}#{dft} > "
if self[:auto] && !force
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This cop tries to produce a complexity score that's a measure of the
complexity the reader experiences when looking at a method. For that
reason it considers when
nodes as something that doesn't add as much
complexity as an if
or a &&
. Except if it's one of those special
case
/when
constructs where there's no expression after case
. Then
the cop treats it as an if
/elsif
/elsif
... and lets all the when
nodes count. In contrast to the CyclomaticComplexity cop, this cop
considers else
nodes as adding complexity.
Example:
def my_method # 1
if cond # 1
case var # 2 (0.8 + 4 * 0.2, rounded)
when 1 then func_one
when 2 then func_two
when 3 then func_three
when 4..10 then func_other
end
else # 1
do_something until a && b # 2
end # ===
end # 7 complexity points
Assignment Branch Condition size for initialize is too high. [17.75/15] Open
def initialize(argv)
@data = {}
@defaults = { verbose: false, tabular: false }
@opt_common = true
@original_argv = argv.dup
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This cop checks that the ABC size of methods is not higher than the configured maximum. The ABC size is based on assignments, branches (method calls), and conditions. See http://c2.com/cgi/wiki?AbcMetric
Method has too many lines. [11/10] Open
def parse(&fun)
if expect_operation
@operation = @argv.shift unless argv.first =~ /^-/
end
OptionParser.new do |opt|
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This cop checks if the length of a method exceeds some maximum value. Comment lines can optionally be ignored. The maximum allowed length is configurable.
Method ask_user
has a Cognitive Complexity of 12 (exceeds 5 allowed). Consider refactoring. Open
def ask_user(question, default = nil, answers = nil, force = false)
ans = " (#{answers.join(' / ')})" unless answers.nil?
dft = " [#{default}]" unless default.nil?
print "#{question}#{ans}#{dft} > "
if self[:auto] && !force
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Cognitive Complexity
Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.
A method's cognitive complexity is based on a few simple rules:
- Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
- Code is considered more complex for each "break in the linear flow of the code"
- Code is considered more complex when "flow breaking structures are nested"
Further reading
Method initialize
has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring. Open
def initialize(argv)
@data = {}
@defaults = { verbose: false, tabular: false }
@opt_common = true
@original_argv = argv.dup
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Cognitive Complexity
Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.
A method's cognitive complexity is based on a few simple rules:
- Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
- Code is considered more complex for each "break in the linear flow of the code"
- Code is considered more complex when "flow breaking structures are nested"
Further reading
(...)
interpreted as grouped expression. Open
raise (msg % { name: k, flag: v }) if self[k].nil?
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Checks for space between the name of a called method and a left parenthesis.
Example:
# bad
puts (x + y)
Example:
# good
puts(x + y)
Method MiGA::Cli#defaults=
is defined at both lib/miga/cli.rb:59 and lib/miga/cli.rb:147. Open
def defaults=(hsh)
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This cop checks for duplicated instance (or singleton) method definitions.
Example:
# bad
def duplicated
1
end
def duplicated
2
end
Example:
# bad
def duplicated
1
end
alias duplicated other_duplicated
Example:
# good
def duplicated
1
end
def other_duplicated
2
end
Avoid rescuing without specifying an error class. Open
rescue => err
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This cop checks for rescuing StandardError
. There are two supported
styles implicit
and explicit
. This cop will not register an offense
if any error other than StandardError
is specified.
Example: EnforcedStyle: implicit
# `implicit` will enforce using `rescue` instead of
# `rescue StandardError`.
# bad
begin
foo
rescue StandardError
bar
end
# good
begin
foo
rescue
bar
end
# good
begin
foo
rescue OtherError
bar
end
# good
begin
foo
rescue StandardError, SecurityError
bar
end
Example: EnforcedStyle: explicit (default)
# `explicit` will enforce using `rescue StandardError`
# instead of `rescue`.
# bad
begin
foo
rescue
bar
end
# good
begin
foo
rescue StandardError
bar
end
# good
begin
foo
rescue OtherError
bar
end
# good
begin
foo
rescue StandardError, SecurityError
bar
end
Use warn
instead of $stderr.puts
to allow such output to be disabled. Open
$stderr.puts ''
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This cop identifies places where $stderr.puts
can be replaced by
warn
. The latter has the advantage of easily being disabled by,
e.g. the -W0 interpreter flag, or setting $VERBOSE to nil.
Example:
# bad
$stderr.puts('hello')
# good
warn('hello')
Use ||
instead of or
. Open
unless answers.nil? or answers.map(&:to_s).include?(y)
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This cop checks for uses of and
and or
, and suggests using &&
and
|| instead
. It can be configured to check only in conditions, or in
all contexts.
Example: EnforcedStyle: always (default)
# bad
foo.save and return
# bad
if foo and bar
end
# good
foo.save && return
# good
if foo && bar
end
Example: EnforcedStyle: conditionals
# bad
if foo and bar
end
# good
foo.save && return
# good
foo.save and return
# good
if foo && bar
end
Favor modifier if
usage when having a single-line body. Another good alternative is the usage of control flow &&
/||
. Open
if expect_files
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Checks for if and unless statements that would fit on one line
if written as a modifier if/unless. The maximum line length is
configured in the Metrics/LineLength
cop.
Example:
# bad
if condition
do_stuff(bar)
end
unless qux.empty?
Foo.do_something
end
# good
do_stuff(bar) if condition
Foo.do_something unless qux.empty?
Redundant self
detected. Open
self.puts(io, MiGA.tabulate(header, values, self[:tabular]))
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This cop checks for redundant uses of self
.
The usage of self
is only needed when:
Sending a message to same object with zero arguments in presence of a method name clash with an argument or a local variable.
Calling an attribute writer to prevent an local variable assignment.
Note, with using explicit self you can only send messages with public or protected scope, you cannot send private messages this way.
Note we allow uses of self
with operators because it would be awkward
otherwise.
Example:
# bad
def foo(bar)
self.baz
end
# good
def foo(bar)
self.bar # Resolves name clash with the argument.
end
def foo
bar = 1
self.bar # Resolves name clash with the local variable.
end
def foo
%w[x y z].select do |bar|
self.bar == bar # Resolves name clash with argument of the block.
end
end
Use ||
instead of or
. Open
if argv[0].nil? or argv[0].to_s[0] == '-'
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This cop checks for uses of and
and or
, and suggests using &&
and
|| instead
. It can be configured to check only in conditions, or in
all contexts.
Example: EnforcedStyle: always (default)
# bad
foo.save and return
# bad
if foo and bar
end
# good
foo.save && return
# good
if foo && bar
end
Example: EnforcedStyle: conditionals
# bad
if foo and bar
end
# good
foo.save && return
# good
foo.save and return
# good
if foo && bar
end
Use a guard clause instead of wrapping the code inside a conditional expression. Open
if klass.KNOWN_TYPES[self[:type]].nil?
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Use a guard clause instead of wrapping the code inside a conditional expression
Example:
# bad
def test
if something
work
end
end
# good
def test
return unless something
work
end
# also good
def test
work if something
end
# bad
if something
raise 'exception'
else
ok
end
# good
raise 'exception' if something
ok
Use warn
instead of $stderr.puts
to allow such output to be disabled. Open
err.backtrace.each { |l| $stderr.puts "DEBUG: #{l}" }
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This cop identifies places where $stderr.puts
can be replaced by
warn
. The latter has the advantage of easily being disabled by,
e.g. the -W0 interpreter flag, or setting $VERBOSE to nil.
Example:
# bad
$stderr.puts('hello')
# good
warn('hello')
Use ||
instead of or
. Open
y = default.to_s if y.nil? or y.empty?
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This cop checks for uses of and
and or
, and suggests using &&
and
|| instead
. It can be configured to check only in conditions, or in
all contexts.
Example: EnforcedStyle: always (default)
# bad
foo.save and return
# bad
if foo and bar
end
# good
foo.save && return
# good
if foo && bar
end
Example: EnforcedStyle: conditionals
# bad
if foo and bar
end
# good
foo.save && return
# good
foo.save and return
# good
if foo && bar
end
Use a guard clause instead of wrapping the code inside a conditional expression. Open
if expect_files
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Use a guard clause instead of wrapping the code inside a conditional expression
Example:
# bad
def test
if something
work
end
end
# good
def test
return unless something
work
end
# also good
def test
work if something
end
# bad
if something
raise 'exception'
else
ok
end
# good
raise 'exception' if something
ok
Prefer single-quoted strings when you don't need string interpolation or special symbols. Open
raise "See `miga -h`" if action.nil?
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Checks if uses of quotes match the configured preference.
Example: EnforcedStyle: single_quotes (default)
# bad
"No special symbols"
"No string interpolation"
"Just text"
# good
'No special symbols'
'No string interpolation'
'Just text'
"Wait! What's #{this}!"
Example: EnforcedStyle: double_quotes
# bad
'Just some text'
'No special chars or interpolation'
# good
"Just some text"
"No special chars or interpolation"
"Every string in #{project} uses double_quotes"
Use warn
instead of $stderr.puts
to allow such output to be disabled. Open
$stderr.puts "Exception: #{err}"
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This cop identifies places where $stderr.puts
can be replaced by
warn
. The latter has the advantage of easily being disabled by,
e.g. the -W0 interpreter flag, or setting $VERBOSE to nil.
Example:
# bad
$stderr.puts('hello')
# good
warn('hello')
Missing magic comment # frozen_string_literal: true
. Open
# @package MiGA
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This cop is designed to help upgrade to Ruby 3.0. It will add the
comment # frozen_string_literal: true
to the top of files to
enable frozen string literals. Frozen string literals may be default
in Ruby 3.0. The comment will be added below a shebang and encoding
comment. The frozen string literal comment is only valid in Ruby 2.3+.
Example: EnforcedStyle: when_needed (default)
# The `when_needed` style will add the frozen string literal comment
# to files only when the `TargetRubyVersion` is set to 2.3+.
# bad
module Foo
# ...
end
# good
# frozen_string_literal: true
module Foo
# ...
end
Example: EnforcedStyle: always
# The `always` style will always add the frozen string literal comment
# to a file, regardless of the Ruby version or if `freeze` or `<<` are
# called on a string literal.
# bad
module Bar
# ...
end
# good
# frozen_string_literal: true
module Bar
# ...
end
Example: EnforcedStyle: never
# The `never` will enforce that the frozen string literal comment does
# not exist in a file.
# bad
# frozen_string_literal: true
module Baz
# ...
end
# good
module Baz
# ...
end
Redundant begin
block detected. Open
begin
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This cop checks for redundant begin
blocks.
Currently it checks for code like this:
Example:
def redundant
begin
ala
bala
rescue StandardError => e
something
end
end
def preferred
ala
bala
rescue StandardError => e
something
end